Systems and methods for frequency offset estimation are provided. This lid assembly may be used for openingclosing process chamber as well as wet-cleaning process chamber in chemical vapor deposition. The perimeter cutting assembly is used to cut the carpet tile and the inner cutting assembly simultaneously forms the discontinuous slits in the inner portion of the carpet tile. The collector may be a passive device which may provide the single potential barrier. The first side portion of the at least one pull wire is adjacent to the first surface of the distal pull assembly, and the second side portion of the at least one pull wire is adjacent to the second surface of the distal pull assembly.